Weighing scales



(No Model.) 2 sheets-sheen 1. P. KOCH. WBIGHING SCALES.

No. 404,290. Patented May 28, 1889.

(No Model.) 2 sheets-sheet' 2. F. KOCH. WBIGHING SCALES.

No. 404.290. Patented May z8, 1889.

N FUCHS, PhamLimognpher, wanhmgmu. uc.

UNITED STATES PATENT OFFICE.

FERDINAND KOCH, OF HANOVER, PRUSSIA, GERMANY.

WEIGHINGjSCALES.

SPECIFICATION forming part of Letters Patent No. 404,290, dated May 28, 1889.

Application filed July G, 1887. Serial No. 243,489. (No model.) Patented in Germany February 4, 1887, No. 40,124, and July 10,1887, No.42,873; in Belgium May 31,1887,N0.77,514; in France .Tune 22, 1887,'No. 134,879, and in England June 23,

lMay 31,1882) of which the following is a complete specification in such full, clear, and

concise terms that anybody who is skilled in the art to which the invention appertains or to which it is most nearly related can understand and use the same, reference being had therein to the accompanying drawings, in which similar letters designate similar parts in all the figures.

My invention relates to the class of scales known under the name of Danish or Swedish scales, which have a scale-pan on the end of a graduated beam, on which a weight slides, the method used till now for graduating the beam being` by experiments and therefore very tedious and costly.

rlhe object of my invention is to avoid these deiicieneies by constructing the weighingbeam in two parts in such a manner that they can be adjusted in reference to each other by screws or other means.

I am aware that screws for adjusting the knife-edges of scales in reference to each other are not new; but it has never been attempted to adjust the part bearing or forming the sliding weight in reference to those parts which bear the common sets of knifeedges.

IVith reference to the accompanying drawings, Figure 1 is a side view of my improved scale or balance. Fig. 2 is a plan of the same. Figs. 3 and 4 show side views of modications of the adjusting device. The knife-edge d can be adjusted on the pins ocby means of the two set-screws p and q. Fig. 5 shows a side view of another modification of my improved scale-beam. Fig. 5 shows a top view of the same.

a, Fig. 1, is the support of the scale or bal ance. The weighing-beam consists of the two parts g and h. The graduated part 7L fitsinto the socket g and is pivoted on the pins` :11, while the short left-hand end rests between the screws p and q, by which it can be adjusted. The part or socket g bears the common two sets of knife-edges d and c and the arm On the knife-edge d hangs the scalepan e, for weighing purposes. The object of my forming the beam so is on account of the center of gravity of the weight Z not being in the same straight line with the knife-edges c and d, or that the line passing through the cent-er of gravity of the weight l and the knifeedge c does not make the same angle with the horizon as a line passing' through the knifeedges c and d, and unless this is the case the proper graduations can only be formed by eX- periment, and are different in length.

In my improved scales I can divide the graduated beam evenly, and without experimenting, after the dierent parts are put 1ogether, as all that is necessary is to adjust the screws p and q till the scale is in equilibrium.

The weight Z is provided with a pawl, 7.-., which catches in notches in the part 71y and is held fast by the spring f. tare levers to facilitate the moving of the weight Z, o being the point at which the graduations on the lcver 7L are read oif. .e is an index-finger fasten ed to the part g, by which fractional weights can be read oit' in divisions marked on. the graduated plate s. e is the scale-pan, in which the articles to be weighed are placed.

In the modification, Figs. 5 and G, 7l is the graduated beam, to which the weightZ is fixed. This arm or beam slides in the sleeve m and rests on the two knife-edges CZ and d. d is iixed to the sleeve m.. d is xed to the socket g. The sleeve m is hinged on the pins 9c to the socket g, which bears the set-screw p, by which the position of the knife-edge d can be altered to that of CZ, and so allowing of an easy adjustment of the beam 7i. in reference to g. amare the supporting-pins, upon which the lever 7i. turns, and c the supporting knife-edge of the socket g and beam 7L on the stand of the balance.

Having now fully described my invention,

IOO

what I claim, and desire to secure by Letters Patent of the United States, isV

1. In scales or balances, the set-screws p q, the lever h, and socket g, the said lever being pivoted in the socket g, and the said socket g bearing the knife-edges d and c and being so arranged that the lever h, bearing or forming the sliding Weight, is adjusted by means of said set-screws, so that theline passingthrough the center of gravity in the direction 0f its length can be adjusted with reference to the two knife-edges d and c, for the purpose as described. g

FERDINAND KOCH.

Witnesses:

En. STEINFELDT, A. BoRoHERs. p 

